Niagara Movement delegates, Boston, Mass., 1907. W. E. B. Du Bois Papers, Robert S. Cox Special Collections and University Archives Research Center, UMass Amherst Libraries.

W. E. B. Du Bois. Credit: W. E. B. Du Bois Papers, Robert S. Cox Special Collections and University Archives Research Center, UMass Amherst Libraries.

William Monroe Trotter. Credit: Harvard University Archives.

Booker T. Washington. Credit: Library of Congress.